Answer: Option B. -> non-volatile storage

Answer: Option A. -> operating system
Definition: An operating system (OS) is a system software that manages computer hardware, software resources, and provides common services for computer programs. It acts as an interface between the user and computer hardware and provides an environment for execution of programs.

Features of Operating System:
• Provides User Interface: Operating systems provide a user interface which allows the user to interact with the computer. It provides a graphical user interface (GUI) and command line interface which allow the user to access the computer’s resources.
• Manages Hardware Resources: Operating systems manage the computer’s hardware resources. It allocates and de-allocates hardware resources to the tasks.
• Manages Memory: Operating systems manage the computer’s main memory. It allocates memory to the programs and processes when they start execution and de-allocates memory when they finish.
• Provides Security: Operating systems provide security features which protect the computer from malicious programs and unauthorized access. It implements access control and authentication mechanisms which restrict access to authorized users.
• Provides Network Access: Operating systems provide network access which allows the user to access other computers on the network. It implements protocols which allow the user to communicate with other computers.

Examples of Operating System:
• Windows
• macOS
• Linux
• Android
• iOS
• Unix

Conclusion: From the above discussion it is clear that the correct answer is option A which is “operating system”. An operating system is a system software that manages computer hardware, software resources, and provides common services for computer programs. It provides a user interface which allows the user to interact with the computer and also provides security features which protect the computer from malicious programs and unauthorized access.

Answer: Option A. -> continuous electrical pulses

Answer: Option C. -> ENlAC

Answer: Option A. -> temporary, permanent

Answer: Option A. -> Input system

Answer: Option C. -> It is a peripheral device

Answer: Option A. -> Input

Answer: Option D. -> COM (Computer Output to Microfilm)

Answer: Option D. -> All of these
An input device is a peripheral device used to provide data and control signals to a computer. There are two types of input devices - direct entry devices and indirect entry devices.
Direct entry input devices are devices that enable the user to enter data directly into the computer without any intermediate processing. Some examples of direct entry input devices include:

• Optical scanners: These are devices that scan printed text or images and convert them into digital data that can be used by the computer. Optical scanners are commonly used for document scanning, barcode scanning, and image scanning.
• Mice: A mouse is a pointing device used to input data and commands into a computer. It is used to move the cursor on the screen, select items, and navigate through menus and applications.
• Digitizers: A digitizer is a device that is used to capture hand-drawn images or handwritten text and convert them into digital data. Digitizers are commonly used in graphic design, animation, and other applications that require accurate and precise input.

Indirect entry input devices are devices that require the input data to be processed before it can be used by the computer. Some examples of indirect entry input devices include:

• Keyboards: A keyboard is a device that is used to input text and commands into a computer. It is the most common input device used for general-purpose computing.
• Touchscreens: A touchscreen is a device that allows the user to input data by touching the screen. It is commonly used in mobile devices and kiosks.

In summary, direct entry input devices enable the user to input data directly into the computer without any intermediate processing. Optical scanners, mice, and digitizers are all examples of direct entry input devices, while keyboards and touchscreens are examples of indirect entry input devices.